The majority of Germans think their country would be better off without the euro, a poll suggested on Sunday, as the economy minister reiterated doubts over whether Greece can stay in the single currency.

The majority of Germans think their country would be better off without the euro, a poll suggested on Sunday, as the economy minister reiterated doubts over whether Greece can stay in the single currency.

The Emnid poll for the Bild am Sonntag mass circulation weekly showed 51 percent of Germans believed Europe's top economy would be better outside the 17-country eurozone. Twenty-nine percent said it would be worse off.

The survey also showed that 71 percent of Germans wanted Greece to leave the euro if it did not live up to its austerity promises.

Economy Minister Philipp Roesler told Bild am Sonntag there were "considerable doubts whether Greece is living up to its reform promises."

"The implementation (of the reforms) is faltering. There is still no functioning tax office. Also, almost nothing has happened in terms of the promised privatization of public assets," Roesler told the paper.

He added: "If Greece does not fulfill its obligations, there can be no more money. Then Greece would be insolvent."

Roesler and his party -- junior partners in Germany's ruling coalition -- have frequently expressed doubts about whether Greece is prepared to follow through with the painful reforms necessary to stay in the single currency club.

Debt-wracked Greece is under immense pressure to carry out a structural reform programme, part of a package worth billions of euros that have been keeping its economy alive since 2010.

International auditors are currently in Greece, assessing the government's progress towards reforms seen as essential to get the country back on its feet.

The audit report will determine whether Greece will receive the next tranche of 31.5 billion euros ($38.8 billion) from its aid program that it needs to keep the economy afloat.

And Finance Minister Wolfgang Schaeuble reiterated Berlin's line that the reforms must be carried out to the letter.

"The aid programme is already very accommodating. I do not see room for further concessions," the minister told the Welt am Sonntag weekly in an interview.

However, the head of the country's chambers of commerce called for an end of the debate about Greece's continued membership of the euro.

"We think it is wrong that, in Germany for example, there is a daily discussion about whether Greece should leave the euro," Martin Wansleben told local agency DPA in an interview.

"That's not our business. It's up to the Greeks to decide," he stressed.